Cam wiped out, what the hell did I do wrong?!?!?

Really sucks. I have not heard or read about a large number of cam lobe issues generally although some seem to have issues that are related to the lack of additives in new oil. Strange the cam bearings are toast. Dont those usually last for ever and ever? I wonder if this could indicate an oiling issue (oil not getting to the cam area?) is your timing chain excessively stretched already? Just speculations here..